f897e6cd5b49b4d5c81faa81e532be79397f6c30
[WebKit-https.git] / Source / WebKit / qt / WebCoreSupport / EditorClientQt.cpp
1 /*
2  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
3  * Copyright (C) 2006 Zack Rusin <zack@kde.org>
4  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
5  * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
6  *
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
22  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
26  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30
31 #include "config.h"
32 #include "EditorClientQt.h"
33
34 #include "CSSStyleDeclaration.h"
35 #include "Document.h"
36 #include "EditCommandQt.h"
37 #include "Editor.h"
38 #include "FocusController.h"
39 #include "Frame.h"
40 #include "HTMLElement.h"
41 #include "HTMLInputElement.h"
42 #include "HTMLNames.h"
43 #include "KeyboardEvent.h"
44 #include "NotImplemented.h"
45 #include "Page.h"
46 #include "PlatformKeyboardEvent.h"
47 #include "QWebPageClient.h"
48 #include "Range.h"
49 #include "Settings.h"
50 #include "WindowsKeyboardCodes.h"
51 #include "qwebpage.h"
52 #include "qwebpage_p.h"
53
54 #include <QUndoStack>
55 #include <stdio.h>
56 #include <wtf/OwnPtr.h>
57
58 #define methodDebug() qDebug("EditorClientQt: %s", __FUNCTION__);
59
60 static QString dumpPath(WebCore::Node *node)
61 {
62     QString str = node->nodeName();
63
64     WebCore::Node *parent = node->parentNode();
65     while (parent) {
66         str.append(QLatin1String(" > "));
67         str.append(parent->nodeName());
68         parent = parent->parentNode();
69     }
70     return str;
71 }
72
73 static QString dumpRange(WebCore::Range *range)
74 {
75     if (!range)
76         return QLatin1String("(null)");
77     WebCore::ExceptionCode code;
78
79     QString str = QString::fromLatin1("range from %1 of %2 to %3 of %4")
80             .arg(range->startOffset(code)).arg(dumpPath(range->startContainer(code)))
81             .arg(range->endOffset(code)).arg(dumpPath(range->endContainer(code)));
82
83     return str;
84 }
85
86
87 namespace WebCore {
88
89 bool EditorClientQt::dumpEditingCallbacks = false;
90 bool EditorClientQt::acceptsEditing = true;
91
92 using namespace HTMLNames;
93
94 bool EditorClientQt::shouldDeleteRange(Range* range)
95 {
96     if (dumpEditingCallbacks)
97         printf("EDITING DELEGATE: shouldDeleteDOMRange:%s\n", dumpRange(range).toUtf8().constData());
98
99     return true;
100 }
101
102 bool EditorClientQt::shouldShowDeleteInterface(HTMLElement* element)
103 {
104     if (QWebPagePrivate::drtRun)
105         return element->getAttribute(classAttr) == "needsDeletionUI";
106     return false;
107 }
108
109 bool EditorClientQt::isContinuousSpellCheckingEnabled()
110 {
111     return false;
112 }
113
114 bool EditorClientQt::isGrammarCheckingEnabled()
115 {
116     return false;
117 }
118
119 int EditorClientQt::spellCheckerDocumentTag()
120 {
121     return 0;
122 }
123
124 bool EditorClientQt::shouldBeginEditing(WebCore::Range* range)
125 {
126     if (dumpEditingCallbacks)
127         printf("EDITING DELEGATE: shouldBeginEditingInDOMRange:%s\n", dumpRange(range).toUtf8().constData());
128     return true;
129 }
130
131 bool EditorClientQt::shouldEndEditing(WebCore::Range* range)
132 {
133     if (dumpEditingCallbacks)
134         printf("EDITING DELEGATE: shouldEndEditingInDOMRange:%s\n", dumpRange(range).toUtf8().constData());
135     return true;
136 }
137
138 bool EditorClientQt::shouldInsertText(const String& string, Range* range, EditorInsertAction action)
139 {
140     if (dumpEditingCallbacks) {
141         static const char *insertactionstring[] = {
142             "WebViewInsertActionTyped",
143             "WebViewInsertActionPasted",
144             "WebViewInsertActionDropped",
145         };
146
147         printf("EDITING DELEGATE: shouldInsertText:%s replacingDOMRange:%s givenAction:%s\n",
148                QString(string).toUtf8().constData(), dumpRange(range).toUtf8().constData(), insertactionstring[action]);
149     }
150     return acceptsEditing;
151 }
152
153 bool EditorClientQt::shouldChangeSelectedRange(Range* currentRange, Range* proposedRange, EAffinity selectionAffinity, bool stillSelecting)
154 {
155     if (dumpEditingCallbacks) {
156         static const char *affinitystring[] = {
157             "NSSelectionAffinityUpstream",
158             "NSSelectionAffinityDownstream"
159         };
160         static const char *boolstring[] = {
161             "FALSE",
162             "TRUE"
163         };
164
165         printf("EDITING DELEGATE: shouldChangeSelectedDOMRange:%s toDOMRange:%s affinity:%s stillSelecting:%s\n",
166                dumpRange(currentRange).toUtf8().constData(),
167                dumpRange(proposedRange).toUtf8().constData(),
168                affinitystring[selectionAffinity], boolstring[stillSelecting]);
169     }
170     return acceptsEditing;
171 }
172
173 bool EditorClientQt::shouldApplyStyle(WebCore::CSSStyleDeclaration* style,
174                                       WebCore::Range* range)
175 {
176     if (dumpEditingCallbacks)
177         printf("EDITING DELEGATE: shouldApplyStyle:%s toElementsInDOMRange:%s\n",
178                QString(style->cssText()).toUtf8().constData(), dumpRange(range).toUtf8().constData());
179     return acceptsEditing;
180 }
181
182 bool EditorClientQt::shouldMoveRangeAfterDelete(WebCore::Range*, WebCore::Range*)
183 {
184     notImplemented();
185     return true;
186 }
187
188 void EditorClientQt::didBeginEditing()
189 {
190     if (dumpEditingCallbacks)
191         printf("EDITING DELEGATE: webViewDidBeginEditing:WebViewDidBeginEditingNotification\n");
192     m_editing = true;
193 }
194
195 void EditorClientQt::respondToChangedContents()
196 {
197     if (dumpEditingCallbacks)
198         printf("EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification\n");
199     m_page->d->updateEditorActions();
200
201     emit m_page->contentsChanged();
202 }
203
204 void EditorClientQt::respondToChangedSelection()
205 {
206     if (dumpEditingCallbacks)
207         printf("EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification\n");
208 //     const Selection &selection = m_page->d->page->selection();
209 //     char buffer[1024];
210 //     selection.formatForDebugger(buffer, sizeof(buffer));
211 //     printf("%s\n", buffer);
212
213     m_page->d->updateEditorActions();
214     emit m_page->selectionChanged();
215     Frame* frame = m_page->d->page->focusController()->focusedOrMainFrame();
216     if (!frame->editor()->ignoreCompositionSelectionChange())
217         emit m_page->microFocusChanged();
218 }
219
220 void EditorClientQt::didEndEditing()
221 {
222     if (dumpEditingCallbacks)
223         printf("EDITING DELEGATE: webViewDidEndEditing:WebViewDidEndEditingNotification\n");
224     m_editing = false;
225 }
226
227 void EditorClientQt::didWriteSelectionToPasteboard()
228 {
229 }
230
231 void EditorClientQt::didSetSelectionTypesForPasteboard()
232 {
233 }
234
235 bool EditorClientQt::selectWordBeforeMenuEvent()
236 {
237     notImplemented();
238     return false;
239 }
240
241 void EditorClientQt::registerCommandForUndo(WTF::PassRefPtr<WebCore::EditCommand> cmd)
242 {
243 #ifndef QT_NO_UNDOSTACK
244     Frame* frame = m_page->d->page->focusController()->focusedOrMainFrame();
245     if (m_inUndoRedo || (frame && !frame->editor()->lastEditCommand() /* HACK!! Don't recreate undos */))
246         return;
247     m_page->undoStack()->push(new EditCommandQt(cmd));
248 #endif // QT_NO_UNDOSTACK
249 }
250
251 void EditorClientQt::registerCommandForRedo(WTF::PassRefPtr<WebCore::EditCommand>)
252 {
253 }
254
255 void EditorClientQt::clearUndoRedoOperations()
256 {
257 #ifndef QT_NO_UNDOSTACK
258     return m_page->undoStack()->clear();
259 #endif
260 }
261
262 bool EditorClientQt::canCopyCut(bool defaultValue) const
263 {
264     return defaultValue;
265 }
266
267 bool EditorClientQt::canPaste(bool defaultValue) const
268 {
269     return defaultValue;
270 }
271
272 bool EditorClientQt::canUndo() const
273 {
274 #ifdef QT_NO_UNDOSTACK
275     return false;
276 #else
277     return m_page->undoStack()->canUndo();
278 #endif
279 }
280
281 bool EditorClientQt::canRedo() const
282 {
283 #ifdef QT_NO_UNDOSTACK
284     return false;
285 #else
286     return m_page->undoStack()->canRedo();
287 #endif
288 }
289
290 void EditorClientQt::undo()
291 {
292 #ifndef QT_NO_UNDOSTACK
293     m_inUndoRedo = true;
294     m_page->undoStack()->undo();
295     m_inUndoRedo = false;
296 #endif
297 }
298
299 void EditorClientQt::redo()
300 {
301 #ifndef QT_NO_UNDOSTACK
302     m_inUndoRedo = true;
303     m_page->undoStack()->redo();
304     m_inUndoRedo = false;
305 #endif
306 }
307
308 bool EditorClientQt::shouldInsertNode(Node* node, Range* range, EditorInsertAction action)
309 {
310     if (dumpEditingCallbacks) {
311         static const char *insertactionstring[] = {
312             "WebViewInsertActionTyped",
313             "WebViewInsertActionPasted",
314             "WebViewInsertActionDropped",
315         };
316
317         printf("EDITING DELEGATE: shouldInsertNode:%s replacingDOMRange:%s givenAction:%s\n", dumpPath(node).toUtf8().constData(),
318                dumpRange(range).toUtf8().constData(), insertactionstring[action]);
319     }
320     return acceptsEditing;
321 }
322
323 void EditorClientQt::pageDestroyed()
324 {
325     delete this;
326 }
327
328 bool EditorClientQt::smartInsertDeleteEnabled()
329 {
330     return m_page->d->smartInsertDeleteEnabled;
331 }
332
333 void EditorClientQt::toggleSmartInsertDelete()
334 {
335     bool current = m_page->d->smartInsertDeleteEnabled;
336     m_page->d->smartInsertDeleteEnabled = !current;
337 }
338
339 bool EditorClientQt::isSelectTrailingWhitespaceEnabled()
340 {
341     return m_page->d->selectTrailingWhitespaceEnabled;
342 }
343
344 void EditorClientQt::toggleContinuousSpellChecking()
345 {
346     notImplemented();
347 }
348
349 void EditorClientQt::toggleGrammarChecking()
350 {
351     notImplemented();
352 }
353
354 static const unsigned CtrlKey = 1 << 0;
355 static const unsigned AltKey = 1 << 1;
356 static const unsigned ShiftKey = 1 << 2;
357
358 struct KeyDownEntry {
359     unsigned virtualKey;
360     unsigned modifiers;
361     const char* editorCommand;
362 };
363
364 // Handle here key down events that are needed for spatial navigation and caret browsing, or
365 // are not handled by QWebPage.
366 static const KeyDownEntry keyDownEntries[] = {
367     // Ones that do not have an associated QAction:
368     { VK_DELETE, 0,                  "DeleteForward"                     },
369     { VK_BACK,   ShiftKey,           "DeleteBackward"                    },
370     { VK_BACK,   0,                  "DeleteBackward"                    },
371     // Ones that need special handling for caret browsing:
372     { VK_PRIOR,  0,                  "MovePageUp"                        },
373     { VK_PRIOR,  ShiftKey,           "MovePageUpAndModifySelection"      },
374     { VK_NEXT,   0,                  "MovePageDown"                      },
375     { VK_NEXT,   ShiftKey,           "MovePageDownAndModifySelection"    },
376     // Ones that need special handling for spatial navigation:
377     { VK_LEFT,   0,                  "MoveLeft"                          },
378     { VK_RIGHT,  0,                  "MoveRight"                         },
379     { VK_UP,     0,                  "MoveUp"                            },
380     { VK_DOWN,   0,                  "MoveDown"                          },
381 };
382
383 const char* editorCommandForKeyDownEvent(const KeyboardEvent* event)
384 {
385     if (event->type() != eventNames().keydownEvent)
386         return "";
387
388     static HashMap<int, const char*> keyDownCommandsMap;
389     if (keyDownCommandsMap.isEmpty()) {
390
391         unsigned numEntries = sizeof(keyDownEntries) / sizeof((keyDownEntries)[0]);
392         for (unsigned i = 0; i < numEntries; i++)
393             keyDownCommandsMap.set(keyDownEntries[i].modifiers << 16 | keyDownEntries[i].virtualKey, keyDownEntries[i].editorCommand);
394     }
395
396     unsigned modifiers = 0;
397     if (event->shiftKey())
398         modifiers |= ShiftKey;
399     if (event->altKey())
400         modifiers |= AltKey;
401     if (event->ctrlKey())
402         modifiers |= CtrlKey;
403
404     int mapKey = modifiers << 16 | event->keyCode();
405     return mapKey ? keyDownCommandsMap.get(mapKey) : 0;
406 }
407
408 void EditorClientQt::handleKeyboardEvent(KeyboardEvent* event)
409 {
410     Frame* frame = m_page->d->page->focusController()->focusedOrMainFrame();
411     if (!frame)
412         return;
413
414     const PlatformKeyboardEvent* kevent = event->keyEvent();
415     if (!kevent || kevent->type() == PlatformKeyboardEvent::KeyUp)
416         return;
417
418     Node* start = frame->selection()->start().containerNode();
419     if (!start)
420         return;
421
422     // FIXME: refactor all of this to use Actions or something like them
423     if (start->rendererIsEditable()) {
424         bool doSpatialNavigation = false;
425         if (isSpatialNavigationEnabled(frame)) {
426             if (!kevent->modifiers()) {
427                 switch (kevent->windowsVirtualKeyCode()) {
428                 case VK_LEFT:
429                 case VK_RIGHT:
430                 case VK_UP:
431                 case VK_DOWN:
432                     doSpatialNavigation = true;
433                 }
434             }
435         }
436
437 #ifndef QT_NO_SHORTCUT
438         QWebPage::WebAction action = QWebPagePrivate::editorActionForKeyEvent(kevent->qtEvent());
439         if (action != QWebPage::NoWebAction && !doSpatialNavigation) {
440             const char* cmd = QWebPagePrivate::editorCommandForWebActions(action);
441             // WebKit doesn't have enough information about mode to decide how commands that just insert text if executed via Editor should be treated,
442             // so we leave it upon WebCore to either handle them immediately (e.g. Tab that changes focus) or let a keypress event be generated
443             // (e.g. Tab that inserts a Tab character, or Enter).
444             if (cmd && frame->editor()->command(cmd).isTextInsertion()
445                 && kevent->type() == PlatformKeyboardEvent::RawKeyDown)
446                 return;
447
448             m_page->triggerAction(action);
449             event->setDefaultHandled();
450             return;
451         } else 
452 #endif // QT_NO_SHORTCUT
453         {
454             String commandName = editorCommandForKeyDownEvent(event);
455             if (!commandName.isEmpty()) {
456                 if (frame->editor()->command(commandName).execute()) // Event handled.
457                     event->setDefaultHandled();
458                 return;
459             }
460
461             if (kevent->windowsVirtualKeyCode() == VK_TAB) {
462                 // Do not handle TAB text insertion here.
463                 return;
464             }
465
466             // Text insertion.
467             bool shouldInsertText = false;
468             if (kevent->type() != PlatformKeyboardEvent::KeyDown && !kevent->text().isEmpty()) {
469
470                 if (kevent->ctrlKey()) {
471                     if (kevent->altKey())
472                         shouldInsertText = true;
473                 } else {
474 #ifndef Q_WS_MAC
475                 // We need to exclude checking for Alt because it is just a different Shift
476                 if (!kevent->altKey())
477 #endif
478                     shouldInsertText = true;
479
480                 }
481             }
482
483             if (shouldInsertText) {
484                 frame->editor()->insertText(kevent->text(), event);
485                 event->setDefaultHandled();
486                 return;
487             }
488         }
489
490         // Event not handled.
491         return;
492     }
493
494     // Non editable content.
495     if (m_page->handle()->page->settings()->caretBrowsingEnabled()) {
496         switch (kevent->windowsVirtualKeyCode()) {
497         case VK_LEFT:
498         case VK_RIGHT:
499         case VK_UP:
500         case VK_DOWN:
501         case VK_HOME:
502         case VK_END:
503             {
504 #ifndef QT_NO_SHORTCUT
505                 QWebPage::WebAction action = QWebPagePrivate::editorActionForKeyEvent(kevent->qtEvent());
506                 ASSERT(action != QWebPage::NoWebAction);
507                 m_page->triggerAction(action);
508                 event->setDefaultHandled();
509 #endif
510                 return;
511             }
512         case VK_PRIOR: // PageUp
513         case VK_NEXT:  // PageDown
514             {
515                 String commandName = editorCommandForKeyDownEvent(event);
516                 ASSERT(!commandName.isEmpty());
517                 frame->editor()->command(commandName).execute();
518                 event->setDefaultHandled();
519                 return;
520             }
521         }
522     }
523
524 #ifndef QT_NO_SHORTCUT
525     if (kevent->qtEvent() == QKeySequence::Copy) {
526         m_page->triggerAction(QWebPage::Copy);
527         event->setDefaultHandled();
528         return;
529     }
530 #endif // QT_NO_SHORTCUT
531 }
532
533 void EditorClientQt::handleInputMethodKeydown(KeyboardEvent* event)
534 {
535     const PlatformKeyboardEvent* kevent = event->keyEvent();
536     if (kevent->type() == PlatformKeyboardEvent::RawKeyDown) {
537         QWebPage::WebAction action = QWebPagePrivate::editorActionForKeyEvent(kevent->qtEvent());
538         switch (action) {
539         case QWebPage::InsertParagraphSeparator:
540         case QWebPage::InsertLineSeparator:
541             m_page->triggerAction(action);
542             break;
543         default:
544             break;
545         }
546     }
547 }
548
549 EditorClientQt::EditorClientQt(QWebPage* page)
550     : m_page(page), m_editing(false), m_inUndoRedo(false)
551 {
552 }
553
554 void EditorClientQt::textFieldDidBeginEditing(Element*)
555 {
556     m_editing = true;
557 }
558
559 void EditorClientQt::textFieldDidEndEditing(Element*)
560 {
561     m_editing = false;
562 }
563
564 void EditorClientQt::textDidChangeInTextField(Element*)
565 {
566 }
567
568 bool EditorClientQt::doTextFieldCommandFromEvent(Element*, KeyboardEvent*)
569 {
570     return false;
571 }
572
573 void EditorClientQt::textWillBeDeletedInTextField(Element*)
574 {
575 }
576
577 void EditorClientQt::textDidChangeInTextArea(Element*)
578 {
579 }
580
581 void EditorClientQt::ignoreWordInSpellDocument(const String&)
582 {
583     notImplemented();
584 }
585
586 void EditorClientQt::learnWord(const String&)
587 {
588     notImplemented();
589 }
590
591 void EditorClientQt::checkSpellingOfString(const UChar*, int, int*, int*)
592 {
593     notImplemented();
594 }
595
596 String EditorClientQt::getAutoCorrectSuggestionForMisspelledWord(const String&)
597 {
598     notImplemented();
599     return String();
600 }
601
602 void EditorClientQt::checkGrammarOfString(const UChar*, int, Vector<GrammarDetail>&, int*, int*)
603 {
604     notImplemented();
605 }
606
607 void EditorClientQt::updateSpellingUIWithGrammarString(const String&, const GrammarDetail&)
608 {
609     notImplemented();
610 }
611
612 void EditorClientQt::updateSpellingUIWithMisspelledWord(const String&)
613 {
614     notImplemented();
615 }
616
617 void EditorClientQt::showSpellingUI(bool)
618 {
619     notImplemented();
620 }
621
622 bool EditorClientQt::spellingUIIsShowing()
623 {
624     notImplemented();
625     return false;
626 }
627
628 void EditorClientQt::getGuessesForWord(const String& word, const String& context, Vector<String>& guesses)
629 {
630     notImplemented();
631 }
632
633 bool EditorClientQt::isEditing() const
634 {
635     return m_editing;
636 }
637
638 void EditorClientQt::willSetInputMethodState()
639 {
640 }
641
642 void EditorClientQt::setInputMethodState(bool active)
643 {
644     QWebPageClient* webPageClient = m_page->d->client.get();
645     if (webPageClient) {
646         Qt::InputMethodHints hints;
647
648         HTMLInputElement* inputElement = 0;
649         Frame* frame = m_page->d->page->focusController()->focusedOrMainFrame();
650         if (frame && frame->document() && frame->document()->focusedNode())
651             if (frame->document()->focusedNode()->hasTagName(HTMLNames::inputTag))
652                 inputElement = static_cast<HTMLInputElement*>(frame->document()->focusedNode());
653
654         if (inputElement) {
655             // Set input method hints for "number", "tel", "email", "url" and "password" input elements.
656             if (inputElement->isTelephoneField())
657                 hints |= Qt::ImhDialableCharactersOnly;
658             if (inputElement->isNumberField())
659                 hints |= Qt::ImhDigitsOnly;
660             if (inputElement->isEmailField())
661                 hints |= Qt::ImhEmailCharactersOnly;
662             if (inputElement->isURLField())
663                 hints |= Qt::ImhUrlCharactersOnly;
664             // Setting the Qt::WA_InputMethodEnabled attribute true and Qt::ImhHiddenText flag
665             // for password fields. The Qt platform is responsible for determining which widget
666             // will receive input method events for password fields.
667             if (inputElement->isPasswordField()) {
668                 active = true;
669                 hints |= Qt::ImhHiddenText;
670             }
671         }
672
673 #if defined(Q_WS_MAEMO_5) || defined(Q_WS_MAEMO_6) || defined(Q_OS_SYMBIAN)
674         // disables auto-uppercase and predictive text for mobile devices
675         hints |= Qt::ImhNoAutoUppercase;
676         hints |= Qt::ImhNoPredictiveText;
677 #endif // Q_WS_MAEMO_5 || Q_WS_MAEMO_6 || Q_OS_SYMBIAN
678         webPageClient->setInputMethodHints(hints);
679         webPageClient->setInputMethodEnabled(active);
680     }
681     emit m_page->microFocusChanged();
682 }
683
684 }
685
686 // vim: ts=4 sw=4 et